US3875134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing ethylene polymer under high pressure
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-05-07
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Granted: 1975-04-01
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Expires: 1993-05-07
Abstract
Abstract Polymerization or copolymerization of ethylene under high pressure is carried out first in an autoclave reactor and the reaction mixture as such, without having been freed of the polymer, is then introduced into the succeeding tubular reactor(s) to continue the polymerization, thus easily resulting in a marked increase in conversion. The resulting polymer is free from gel-forming materials and is improved in processibility.
Inventors
- 👤 Minoru Morikawa
- 👤 Ryuichi Sonoda
- 👤 Kiyoshi Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:50
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/243; C; C08; C08F; C08F10/00; C08F10/02; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00105; B01J2219/0011; B01J2219/00162; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A PROCESS FOR PRODUCING AN ETHYLENE POLYMER UNDER A HIGH PRESSURE, WHICH COMPRISES FIRST FEEDING COMPRESSED ETHYLENE OR A COMPRESSED MISTURE OF ETHYLENE AND COMONOMERS COPOLYMERIZABLE WITH ETHYLENE INTO AN AUTOCLAVE REACTOR, POLYMERIZING SAID ETHYLENE OR SAID MIXTURE OF ETHYLENE AND COMONOMERS UNDER A PRESSURE OF 1,000 TO 4,000 KG/CM2 AT A TEMPERATURE OF 120* TO 350*C BY ADDITION OF 5 TO 3,000 PARTS BY WEIGJT OF A CATALYST FOR 1,000,000 PARTS BY WEIGHT OF THE ETHYLENE OR MIXTURE OF ETHYLENE AND COMONOMER, PASSING THE REACTION MIXTURE THROUGH A HEAT EXCHANGER, THEN INTRODUCING THE REACTION MIXTURE INTO A TUBULAR REACTOR, AND FURTHER POLYMERIZING ETHYLENE OR COPOLYMERIZING A MIXTURE OF ETHYLENE AND COMONOMERS COPOLYMERIZABLE WITH ETHYLENE UNDER A PRESSURE OF 1,000 TO 4,000 KG/CM2 AT A TEMPERATURE OF 120* TO 350*C BY FURTHER ADDITION OF 5 TO 3,000 PARTS BY WEIGHT OF A CATALYST FOR 1,000,000 PARTS BY WEIGHT OF THE ETHYLENE OR A MIXTURE OF ETHYLENE AND COMONOMER.
Claim 2
Dependent Claim
158 words
A PROCESS FOR PRODUCING AN ETHYLENE POLYMER UNDER A HIGH PRESSURE, WHICH COMPRISES FIRST FEEDING COMPRESSED ETHYLENE OR A COMPRESSED MISTURE OF ETHYLENE AND COMONOMERS COPOLYMERIZABLE WITH ETHYLENE INTO AN AUTOCLAVE REACTOR, POLYMERIZING SAID ETHYLENE OR SAID MIXTURE OF ETHYLENE AND COMONOMERS UNDER A PRESSURE OF 1,000 TO 4,000 KG/CM2 AT A TEMPERATURE OF 120* TO 350*C BY ADDITION OF 5 TO 3,000 PARTS BY WEIGJT OF A CATALYST FOR 1,000,000 PARTS BY WEIGHT OF THE ETHYLENE OR MIXTURE OF ETHYLENE AND COMONOMER, PASSING THE REACTION MIXTURE THROUGH A HEAT EXCHANGER, THEN INTRODUCING THE REACTION MIXTURE INTO A TUBULAR REACTOR, AND FURTHER POLYMERIZING ETHYLENE OR COPOLYMERIZING A MIXTURE OF ETHYLENE AND COMONOMERS COPOLYMERIZABLE WITH ETHYLENE UNDER A PRESSURE OF 1,000 TO 4,000 KG/CM2 AT A TEMPERATURE OF 120* TO 350*C BY FURTHER ADDITION OF 5 TO 3,000 PARTS BY WEIGHT OF A CATALYST FOR 1,000,000 PARTS BY WEIGHT OF THE ETHYLENE OR A MIXTURE OF ETHYLENE AND COMONOMER.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein linear velocity of the reaction mixture in the tubular reactor is 5 to 35 meters per second.
Claim 4
Dependent Claim
20 words
A process according to claim 1, wherein the polymerization is carried out under a pressure of 1,200 to 3,000 kg/cm2.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein the polymerization is carried out at a temperature of 150* to 300*C.
Claim 6
Dependent Claim
49 words
A process according to claim 1, wherein the comonomer copolymerizable with ethylene is a member selected from the group consisting of vinyl acetate, vinyl formate, vinyl butylate, methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, acrylamide, methacrylamide, methylvinyl ether, t-butyl vinyl ether, methyl vinyl ketone, maleic anhydride and styrene.
Claim 7
Dependent Claim
53 words
A process according to claim 1, wherein the catalyst is At least one member selected from the group consisting of oxygen, di-t-butyl peroxide, diethyl peroxide, t-butyl perbenzoate, t-butyl peracetate, methyl ethyl ketone peroxide, t-butyl hydro peroxide, acetyl peroxide, benzoyl peroxide, di-isopropyl peroxydicarbonate, succinic acid peroxide, acetone oxime, benzylidene azine, azobis(isobutyronitrile), 2,2''-azobis(methylisobutylate) and 2,2''-azobis(isobutylamide).
Claim 8
Dependent Claim
23 words
A process according to claim 1, wherein the pressure of polymerization reaction is regulated simultaneously in the autoclave reactor and the tubular reactor.
Claim 9
Dependent Claim
26 words
A process according to claim 1, wherein the pressure of polymerization reaction is regulated in the autoclave reactor and the tubular reactor independently to each other.
Claim 10
Dependent Claim
26 words
A process according to claim 1, wherein introduction of the catalyst into the tubular reactor is conducted at one or more points along the reactor tube.
Claim 11
Dependent Claim
19 words
A process according to claim 1 wherein ethylene is fed into said autoclave reactor and homopolymerized in said process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |